Sorry, forgot to use "reply to all"
---------- Forwarded message ---------
From: André Roberge <andre.robe...@gmail.com>
Date: Sat, Nov 14, 2020 at 11:06 AM
Subject: Re: [Python-ideas] Re: Global flag for whether a module is __main__
To: Steven D'Aprano <st...@pearwood.info>
On Sat, Nov 14, 2020 at 10:45 AM Steven D'Aprano <st...@pearwood.info>
wrote:
> On Sat, Nov 14, 2020 at 08:10:44AM -0400, André Roberge wrote:
>
> > > What if you import the `__main__` module? What does `__imported__` say
> > > now, and how do you check for "running as a script" if `__main__` has
> > > imported itself -- or some other module has imported it?
> > >
> >
> > Running a module (no matter what its name is) from a command line would
> set
> > __imported__ to False for that module.
> > Using import some_module (or __import__("some_module")) would set
> > some_module.__imported__ to True.
>
> Do you understand that a module can be both run and imported at the
> same time?
>
>
> # example.py
> import __main__
> print(__main__.__file__)
>
> As others have mentioned, many beginners are thoroughly confused by the
meaning of the idiom
if __name__ == "__main__":
...
The idea behind the name __imported__ (and, I gather, somewhat similar to
the original suggestion of __main__ that started this thread) is to reduce
such confusion.
For what I had in mind, the semantic would be the same as though the
following was inserted at the top of the module:
__imported__ = True
if __name__ == "__main__":
__imported__ = False
André
> If you save that snippet as "example.py", and then run it:
>
> python3 example.py
>
> you have an example of a module that is being run and imported
> simultaneously.
>
>
> --
> Steve
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